Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q5/00—Preparations for care of the hair
  • A61Q5/10—Preparations for permanently dyeing the hair
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
  • A61K8/25—Silicon; Compounds thereof
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
  • A61K2800/20—Chemical, physico-chemical or functional or structural properties of the composition as a whole
  • A61K2800/30—Characterized by the absence of a particular group of ingredients

Definitions

• the subject of the invention is a composition for the oxidation dyeing of human keratinous fibres and in particular hair comprising, in a cosmetically acceptable medium based on water and at a basic pH, at least one oxidation dye and an alkalinizing agent consisting of sodium metasilicate and aqueous ammonia, and the dyeing method using this composition.
• Oxidation dyes comprise oxidation dye precursors and couplers.
• Oxidation dye precursors generally called oxidation bases, are colourless or weakly coloured compounds which, combined with oxidizing products, can give rise to coloured and dye compounds by a process of oxidative condensation. They are in particular ortho- or para-phenylene diamines ortho- or para-aminophenols, or heterocyclic bases.
• the shades obtained with these oxidation bases may be modified by combining the said bases with couplers or colour modifiers, the couplers being chosen in particular from aromatic meta-diamines, meta-aminophenols, meta-diphenols and certain heterocyclic compounds.
• the oxidation dyeing method consists in applying to the fibres oxidation bases or a mixture of oxidation bases and couplers with an oxidizing agent, most often hydrogen peroxide, in allowing to act, and then in rinsing the fibres.
• the application which is generally carried out at a basic pH, makes it possible to obtain dyeing and simultaneously lightening of the fibre, which results in practice in the possibility of obtaining a final coloration which is lighter than the original colour.
• the lightening of the fibre has the advantageous effect of generating a uniform colour in the case of grey hair, and in the case of naturally pigmented hair, of making the colour stand out, that is to say of making it more visible.
• tone height which characterizes the degree or level of lightening.
• tone is based on the classification of natural shades, a tone separating each shade from the one immediately following it or preceding it. This definition and the classification of natural shades is well known to hair styling professionals and is published in the book “Sciences des.s capillaires” [Science of hair treatment] by Charles ZVIAK, 1988, Ed. Masson, pp. 215 and 278.
• the tone heights range from 1 (black) to 10 (light blonde), one unit corresponding to one tone; the higher the figure, the lighter the shade.
• aqueous ammonia has the major disadvantage or releasing a very irritant and unpleasant odour during application of the dye. It also sometimes causes, in high concentrations, irritations of the scalp in the form of pricklings.
• the first subject of the invention is therefore a dyeing composition for the oxidation dyeing of human keratinous fibres and more particularly hair, free of oxidizing agent, comprising, in a cosmetically acceptable medium based on water and at a basic pH, at least one oxidation dye and an alkalinizing agent, characterized in that the alkalinizing agent is a combination of sodium metasilicate and aqueous ammonia.
• composition is understood to mean, for the purposes of the invention, a composition comprising at least one oxidation dye, which has to be in the presence of an oxidizing agent during use.
• the dyeing composition in accordance with the invention makes it possible to reduce the amount of aqueous ammonia conventionally used while the dyeing properties are perfectly maintained and makes it possible to formulate less odorous and less irritating products.
• the subject of the invention is also a method for the oxidation dyeing of human keratinous fibres and more particularly hair using the said dyeing composition.
• the method consists in mixing, at the time of use, a dyeing composition comprising 0.4 to 1.3 %by weight of ammonia relative to the total weight of the dyeing composition, with an oxidizing composition comprising hydrogen peroxide or a compound capable of releasing hydrogen peroxide in situ, or an oxidoreduction enzyme; the amount of the oxidizing composition being at most 6 times the amount of the dyeing composition; the mixture obtained is then applied to the fibres, is allowed to act, after which the fibres are rinsed, optionally washed with shampoo and rinsed again, and dried.
• the invention is also relating to a method for the oxidation dyeing of human keratinous fibres and more particularly hair using the said dyeing composition.
• the method consists in mixing, at the time of use, a dyeing composition comprising 1 to 3 %by weight of sodium metasilicate, relative to the total weight of the dyeing composition, with an oxidizing composition comprising hydrogen peroxide or a compound capable of releasing hydrogen peroxide in situ, or an oxidoreduction enzyme; the amount of the oxidizing composition being at at least the amount of the dyeing composition; the mixture obtained is then applied to the fibres, is allowed to act, after which the fibres are rinsed, optionally washed with shampoo and rinsed again, and dried.
• Another subject of the invention is a ready-to-use composition for the oxidation dyeing of human keratinous fibres, and more particularly hair comprising the mixture of a dyeing composition described above, comprising 0.4 to 1.3 % by weight of ammonia, relative to the total weight of the dyeing composition, and an oxidizing composition; the amount of the oxidizing composition being at most 6 times the amount of the dyeing composition.
• Another subject of the invention is a ready-to-use composition for the oxidation dyeing of human keratinous fibres, and more particularly hair comprising the mixture of a dyeing composition described above, comprising 1 to 3 % by weight of sodium metasilicate, relative to the total weight of the dyeing composition, and an oxidizing composition; the amount of the oxidizing composition being at least the amount of the dyeing composition.
• ready-to-use composition is understood to mean, for the purposes of the invention, the composition intended to be applied as it is to keratinous fibres, that is to say that it can be stored as it is before use or can result from mixing two compositions immediately before use.
• Alkalinizing agent The combination according to the invention of sodium metasilicate and aqueous ammonia used as alkalinizing agent should make it possible to adjust the pH of the dyeing composition of the present invention at a basic pH, more particularly at a pH from 7.5 to 13, and preferably from 8.5 to 11.5.
• the said combination comprises, as active substance, more particularly at least 0.1 % by weight, preferably at least 0.5 % by weight, and more preferably at least 0.1 % by weight of sodium metasilicate, relative to the total weight of the dyeing composition.
• the amount of sodium metasilicate in the combination is advantageously of at most 6% by weight, more particularly of at most 5 % by weight, and preferably of at most 3 % by weight, relative to the total weight of the dyeing composition. More particularly, the said combination comprises, as active substance, from 0.1 to 6% by weight approximately of sodium metasilicate, preferably from 0.5 to 5%, and more particularly from 1 to 3% relative to the total weight of the dyeing composition.
• the said combination comprises, as active substance, more particularly at least 0.1 % by weight, preferably at least 0.4 % by weight, and more preferably at least 0.6 % by weight of ammonia, relative to the total weight of the dyeing composition.
• the amount of ammonia in the combination is more especially of at most 1.6% by weight, preferably of at most 1.3 % by weight, more preferably of at most 1.2 % by weight, and more particularly of at most 1 % by weight, relative to the total weight of the dyeing composition. More particularly, the combination comprises from 0.1 to 1.6% by weight approximately of ammonia, preferably from 0.4 to 1.3% by weight, more particularly from 0.4 to 1.2 % by weight, and more preferably from 0.6 to 1% by weight, relative to the total weight of the dyeing composition.
• the weight ratio of ammonia to sodium metasilicate is comprised between 0.02 and 15, more particularly between 0.1 and 5, preferably between 0.3 and 2, and more preferably between 0.4 and 1.
• sodium metasilicate [Na 2 SiO 3 ] is an anhydrous compound, but it can also exist in its hydrated forms with 5 or 9 molecules of water.
• Ammonia is introduced into the formulae in the form of aqueous ammonia, which is an aqueous solution of ammonia.
• the aqueous ammonia generally used has a titre of 20 to 25% by weight of ammonia.
• the present invention makes it possible to reduce the amount of aqueous ammonia on the basis of an aqueous solution having a titre of 20.5% ammonia, from 20 to 80% and more particularly from 30 to 60%.
• the cosmetically acceptable medium for dyeing in accordance with the invention consists of water or of a mixture of water and at least one organic solvent for solubilizing the compounds which might not be sufficiently soluble in water.
• organic solvent there may be mentioned, for example, C C 4 alkanols, such as ethanol and isopropanol; glycerol; glycols and glycol ethers such as 2-butoxyethanol, propylene glycol, monomethyl ether of propylene glycol, monoethyl ether and monomethyl ether of diethylene glycol, and aromatic alcohols such as benzyl alcohol or phenoxyethanol, analogous products and mixtures thereof.
• the solvents may be present in proportions preferably ranging from 1 to 40% by weight approximately relative to the total weight of the dyeing composition, and still more preferably from 5 to 30% by weight approximately.
• Oxidation dyes which can be used according to the invention are chosen from oxidation bases and/or couplers.
• compositions according to the invention contain at least one oxidation base.
• the oxidation bases are chosen from those conventionally known in oxidation dyeing, and among which there may be mentioned in particular ortho- and para- phenylenediamines, double bases, ortho- and para-aminophenols, the following heterocyclic bases and their addition salts with an acid.
• Ri represents a hydrogen atom, a d-C alkyl radical, a monohydroxy(C C 4 alkyl) radical, a polyhydroxy-(C 2 -C 4 alkyl) radical, a (CrC 4 )alkoxy(C ⁇ -C 4 )alkyl radical, a C C 4 alkyl radical substituted with a nitrogen-containing group, a phenyl radical or a 4'- aminophenyl radical;
• R 2 represents a hydrogen atom, a C r C 4 alkyl radical, a monohydroxy(C C 4 alkyl) radical, a polyhydroxy(C 2 -C 4 alkyl) radical, a (C C ⁇ alkoxy ⁇ C ⁇ alkyl radical or a C C 4 alkyl radical substituted with a nitrogen-containing group;
• R T and R 2 may also form with the nitrogen atom carrying them a 5- or 6-membered nitrogen-containing heterocycle optionally substituted with one or more alkyl, hydroxyl or ureido groups;
• R 3 represents a hydrogen atom, a halogen atom such as a chlorine atom, a C C 4 alkyl radical, a sulpho radical, a carboxyl radical, a monohydroxy(CrC alkyl) radical, a hydroxy(C ⁇ -C 4 alkoxy) radical, an acetylamino(CrC alkoxy) radical, a mesylamino(C ⁇ -C alkoxy) radical or a carbamoylamino(C ⁇ -C 4 alkoxy) radical,
• R 4 represents a hydrogen or halogen atom or a CrC 4 alkyl radical.
• nitrogen-containing groups of formula (I) above there may be mentioned in particular the amino, mono(C C 4 )alkylamino, (CrC 4 )dialkylamino, (CrC ⁇ trialkylamino, monohydroxy(CrC )alkylamino, imidazolinium and ammonium radicals.
• para-phenylenediamines of formula (I) above there may be mentioned more particularly para-phenylenediamine, para-tolylenediamine, 2-chloro-paraphenylene- diamine, 2,3-dimethyl-para-phenylenediamine, 2,6-dimethyl-para-phenylenediamine, 2,6-diethyl-para-phenylenediamine, 2,5-dimethyl-para-phenylenediamine, N,N-dimethyl- para-phenylenediamine, N,N-diethyl-para-phenylenediamine, N,N-dipropyl-para- phenylenediamine, 4-amino-N,N-diethyl-3-methylaniline, N,N-bis( ⁇ -hydroxyethyl)-para- phenylenediamine, 4-N,N-bis( ⁇ -hydroxyethyl)amino-2-methylaniline, 4-N,N-bis( ⁇ - hydroxy
• para-phenylenediamines of formula (I) above there are most particularly preferred para-phenylenediamine, para-tolylenediamine, 2-isopropyl-paraphenylene- diamine, 2- ⁇ -hydroxyethyl-para-phenylenediamine, 2- ⁇ -hydroxyethyloxy-para-phenylene- diamine, 2,6-dimethyl-para-phenylenediamine, 2,6-diethyl-para-phenylenediamine, 2,3- dimethyl-para-phenylenediamine, N,N-bis( ⁇ -hydroxyethyl)-para-phenylenediamine, 2- chloro-para-phenylenediamine, and their addition salts with an acid.
• double bases is understood to mean the compounds containing at least two aromatic rings on which amino and/or hydroxyl groups are carried.
• - Zi and Z 2 which are identical or different, represent a hydroxyl or -NH 2 radical which may be substituted with a C C alkyl radical or with a linking arm Y;
• the linking arm Y represents a linear or branched alkylene chain comprising from 1 to 14 carbon atoms, which may be interrupted by or which may end with one or more nitrogen-containing groups and/or one or more heteroatoms such as oxygen, sulphur or nitrogen atoms, and optionally substituted with one or more hydroxyl or C C 6 alkoxy radicals;
• R 5 and R 6 represent a hydrogen or halogen atom, a C C 4 alkyl radical, a monohydroxy(C- ⁇ -C 4 alkyl) radical, a polyhydroxy(C 2 -C 4 alkyl) radical, an amino(C C 4 alkyl) radical or a linking arm Y;
• R 7 , R 8 , R , R-io, R11 and R ⁇ 2 which are identical or different, represent a hydrogen atom, a linking arm Y or a C C 4 alkyl radical; it being understood that the compounds of formula (II) contain only one linking arm Y per molecule.
• nitrogen-containing groups of formula (II) above there may be mentioned in particular the amino, mono(C C 4 )alkylamino, (C C 4 )dialkylamino, (C r C 4 )trialkylamino, monohydroxy(CrC )alkylamino, imidazolinium and ammonium radicals.
• N,N'-bis( ⁇ -hydroxyethyl)-N,N'-bis(4'-aminophenyl)-1 ,3-diaminopropanol N,N'- bis( ⁇ -hydroxyethyl)-N,N'-bis(4'-aminophenyl)ethylenediamine, N,N'-bis(4-aminophenyl)- tetramethylenediamine, N,N'-bis( ⁇ -hydroxyethyl)-N,N'-bis(4-aminophenyl)tetramethylene- diamine, N,N'-bis(4-methylaminophenyl)tetramethylenediamine, N,N'-bis(ethyl)-N,N'- bis(4'-amino-3'-methylphenyl)ethylene-diamine, 1,8-bis(2,5-diaminophenoxy)-3
• N,N'-bis( ⁇ -hydroxyethyl)-N,N'-bis(4'- aminophenyl)-1 ,3-diaminopropanol, 1,8-bis(2,5-diaminophenoxy)-3,5-dioxaoctane or one of their addition salts with an acid are particularly preferred.
• R 13 represents a hydrogen atom, or a halogen atom such as fluorine, a C C 4 alkyl, monohydroxy(C ⁇ -C 4 alkyl), (C ⁇ -C 4 )alkoxy(C C 4 )-alkyl, amino(C C 4 alkyl) or hydroxy(C
• C 4 )alkylamino-(C ⁇ -C 4 alkyl) radical - R 14 represents a hydrogen atom, or a halogen atom such as fluorine, a C r C 4 alkyl, monohydroxy(C ⁇ -C 4 alkyl), polyhydroxy(C 2 -C 4 alkyl), amino(CrC 4 alkyl), cyano(C C 4 alkyl) or (C ⁇ -C 4 )alkoxy(C r C )alkyl radical.
• para-aminophenols of formula (III) above there may be mentioned more particularly para-aminophenol, 4-amino-3-methylphenol, 4-amino-3-fluorophenol, 4- amino-3-hydroxymethylphenol, 4-amino-2-methylphenol, 4-amino-2-hydroxymethyl- phenol, 4-amino-2-methoxymethylphenol, 4-amino-2-aminomethylphenol, 4-amino-2-( ⁇ - hydroxyethylaminomethy phenol, and their addition salts with an acid.
• the ortho-aminophenols which can be used as oxidation bases in the context of the present invention are chosen in particular from 2-aminophenol, 2-amino-1-hydroxy-5- methylbenzene, 2-amino-1-hydroxy-6-methylbenzene, 5-acetamido-2-aminophenol, and their addition salts with acid.
• -(V) Among the heterocyclic bases which can be used as oxidation bases in the dyeing compositions in accordance with the invention, there may be mentioned more particularly pyridine derivatives, pyrimidine derivatives, pyrazole derivatives, and their addition salts with an acid.
• pyridine derivatives there may be mentioned more particularly the compounds described for example in Patents GB 1,026,978 and GB 1 ,153,196, such as 2,5-diaminopyridine, 2-(4-methoxyphenyl)amino-3-aminopyrid ⁇ ne, 2,3-diamino-6- methoxypyridine, 2-( ⁇ -methoxyethyl)amino-3-amino-6-methoxypyridine, 3,4-diamino- pyridine, and their addition salts with an acid.
• pyrimidine derivatives there may be mentioned more particularly the compounds described, for example, in Patents DE 2359399; JP 88-169571; JP 91- 10659 or Patent Application WO 96/15765, such as 2,4,5,6-tetraaminopyrimidine, 4- hydroxy-2,5,6-triaminopyrimidine, 2-hydroxy-4,5,6-triaminopyrimidine, 2,4-dihydroxy-5,6- diaminopyrimidine, 2,5,6-triamino-pyrimidine, and the pyrazolopyrimidine derivatives such as those mentioned in Patent Application FR-A-2750048 and among which there may be mentioned pyrazolo[1 ,5-a]-pyrimidine-3,7-diamine; 2,5-dimethyl-pyrazolo[1 ,5-a]- pyrimidine-3,7-diamine; pyrazolo[1 ,5-a]pyrimidine-3,5-diamine; 2,7-
• pyrazole derivatives there may be mentioned more particularly the compounds described in Patents DE 3 843 892, DE 4 133 957 and Patent Applications WO 94/08969, WO 94/08970, FR-A-2 733 749 and DE 19543988 such as 4,5-diamino- 1 -methylpyrazole, 3,4-diaminopyrazole, 4,5-diamino-1-(4'-chlorobenzyl)-pyrazole, 4,5- diamino-1 ,3-dimethylpyrazole, 4,5-diamino-3-methyl-1 -phenylpyrazole, 4,5-diamino-1 - methyl-3-phenylpyrazole, 4-amino-1 ,3-dimethyl-5-hydrazino-pyrazole, 1 -benzyl-4,5- diamino-3-methyl-pyrazole, 4,5-diamino-3-tert-butyl-1 -methylpyrazo
• the oxidation bases preferably represent from 0.0005 to 12% by weight approximately of the total weight of the composition, and still more preferably from 0.005 to 8% by weight approximately of this weight.
• the couplers which can be used in the dyeing composition according to the invention are those conventionally used in oxidation dyeing compositions, that is to say meta- aminophenols, meta-phenylenediamines, meta-diphenols, naphthols and heterocyclic couplers such as, for example, indole derivatives, indoline derivatives, sesamol and its derivatives, pyridine derivatives, pyrazolotriazole derivatives, pyrazolones, indazoles, benzimidazoles, benzothiazoles, benzoxazoles, 1 ,3-benzodioxoles, quinolines and their addition salts with an acid.
• couplers are more particularly chosen from 2,4-diamino-1-( ⁇ - hydroxyethyloxy)benzene, 2-methyl-5-aminophenol, 5-N-( ⁇ -hydroxyethyl)amino-2 ⁇ methylphenol, 3-aminophenol, 2-chloro-3-amino-6-methylphenol, 1 ,3-dihydroxybenzene, 1 ,3-dihydroxy-2-methylbenzene, 4-chloro-1 ,3-dihydroxybenzene, 2-amino-4-( ⁇ -hydroxy ethylamino)-1 -methoxybenzene, 1 ,3-diaminobenzene, 1 ,3-bis(2,4-diaminophenoxy)- propane, sesamol, 1-amino-2-methoxy-4,5-methylene-dioxybenzene, ⁇ -naphthol, 6- hydroxyindole, 4-hydroxyindole, 4-hydroxy-N-methylindole, 6-hydroxy-
• these couplers preferably represent from 0.0001 to 10% by weight approximately of the total weight of the composition, and still more preferably from
• addition salts with an acid of the oxidation bases and couplers are chosen in particular from the hydrochlorides, hydrobromides, sulphates, tartrates, lactates and acetates.
• composition according to the invention may also contain, in addition to the oxidation dyes defined above, direct dyes for enriching the shades with glints.
• direct dyes may then be chosen in particular from neutral, cationic or anionic nitro, azo or anthraquinone dyes in the proportion by weight of about 0.001 to 20%, and preferably 0.01 to 10% of the total weight of the composition.
• the dyeing composition in accordance with the invention may also contain various adjuvants which are conventionally used in hair dyeing compositions, such as anionic, cationic, nonionic, amphoteric or zwitterionic surfactants or mixtures thereof, fatty alcohols, fatty acids, anionic, cationic, nonionic, amphoteric or zwitterionic polymers or mixtures thereof, inorganic or organic thickening agents or thickening polymers such as, for example, nonionic guar gums, associative polymers containing at least one hydrophilic unit and at least one fatty chain and of a nonionic, anionic, cationic or amphoteric nature, antioxidants or reducing agents, penetrating agents, sequestering agents such as EDTA and etidronic acid, UV-screening agents, waxes, perfumes, buffers, dispersing agents, conditioning agents such as, for example, modified or unmodified, volatile or nonvolatile silicones, film-forming agents,
• the dyeing composition of the invention contains at least one cationic polymer in the proportion of about 0.05 to 10% by weight, and at least one surfactant, which is preferably nonionic, in the proportion of 0.1 to 20% by weight.
• it also contains at least one thickening polymer preferably chosen from associative polymers in the proportion of about 0.05 to 10% by weight.
• the reducing agents or antioxidants may be chosen in particular from sodium sulphite, thioglycolic acid and thiolactic acid and their salts of ammonium, sodium bisulphite, dehydroascorbic acid, hydroquinone, 2-methylhydroquinone, tert-butylhydroquinone, homogentisic acid, and they are then generally present in quantities ranging from about 0.05 to 3% by weight relative to the total weight of the composition.
• the dyeing method according to the invention comprises the following steps: there are mixed, at the time of use, a dyeing composition as described above and in particular comprising, in a cosmetically acceptable medium based on water and at a basic pH, at least one oxidation dye and a combination of sodium metasilicate and aqueous ammonia, the amount of ammonia being from 0.4 to 1.3 % by weight relative to the total weight of the dyeing composition, with an oxidizing composition; the amount of the oxidizing composition being at most 6 times the weight of the dyeing composition, the mixture obtained is then applied to the keratinous fibres, it is allowed to act, after which the keratinous fibres are rinsed, optionally washed with shampoo and rinsed again, then dried.
• the weight ratio dyeing composition / oxidizing composition is comprised between 2/1 and 1/6, and preferably between 1/1 and 1/3.
• the dyeing method according to the invention comprises the following steps: there are mixed, at the time of use, a dyeing composition as described above and in particular comprising, in a cosmetically acceptable medium based on water and at a basic pH, at least one oxidation dye and a combination of sodium metasilicate and aqueous ammonia, the amount of sodium metasilicate being from 1 to 3 % by weight relative to the total weight of the dyeing composition, with an oxidizing composition; the amount of the oxidizing composition being at least the weight of the dyeing composition, the mixture obtained is then applied to the keratinous fibres, it is allowed to act, after which the keratinous fibres are rinsed, optionally washed with shampoo and rinsed again, then dried.
• the weight ratio dyeing composition / oxidizing composition is comprised between 1/1 and 1/6, and preferably between 1/1 and 1/3.
• the pH of the composition is ranging more particularly from 7.5 to 13.
• the said mixture is advantageously allowed to act for 3 to 50 minutes approximately, preferably 5 to 30 minutes approximately.
• the dyeing composition before mixing with the oxidant, may be in various forms, such as a liquid, cream or gel form, optionally pressurized or in any other form appropriate for carrying out, after mixing, a dyeing of human keratinous fibres and in particular hair.
• the oxidizing agent is chosen from hydrogen peroxide and compounds capable of releasing hydrogen peroxide in situ, oxidoreduction enzymes such as laccases, peroxidases and oxidoreductases containing 2 electrons (such as uricase), where appropriate in the presence of their respective donor or cofactor.
• oxidoreduction enzymes such as laccases, peroxidases and oxidoreductases containing 2 electrons (such as uricase), where appropriate in the presence of their respective donor or cofactor.
• This oxidizing agent advantageously consists of a solution of hydrogen peroxide whose titre may vary, more particularly, from about 1 to 40 volumes, and still more preferably from about 5 to 40.
• the ready-to-use composition for the oxidation dyeing of human keratinous fibres, and more particularly hair comprising the mixture of a dyeing composition described above, comprising 0.4 to 1.3 % by weight of ammonia, relative to the total weight of the dyeing composition, with an oxidizing composition; the amount of the oxidizing composition being at most 6 times the amount of the dyeing composition.
• the weight ratio dyeing composition / oxidizing composition is comprised between 2/1 and 1/6, and preferably between 1/1 and 1/3.
• a second embodiment consists in a ready-to-use composition for the oxidation dyeing of human keratinous fibres, and more particularly hair comprising the mixture of a dyeing composition described above, comprising 1 to 3 % by weight of sodium metasilicate, relative to the total weight of the dyeing composition, with an oxidizing composition; the amount of the oxidizing composition being at least the amount of the dyeing composition.
• the weight ratio dyeing composition / oxidizing composition is comprised between 1/1 and 1/6, and preferably between 1/1 and 1/3.
• each dyeing composition described above is mixed weight for weight with a solution of hydrogen peroxide at 20 volumes (6% by weight).
• the hair was dyed in a strong shade of golden blonde colour for each of Examples 1 to 3.
• compositions 1 to 3 were preserved.

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